Abstract
If you've ever copied text and pasted it elsewhere, or used the find-and-replace function, you owe a debt to Larry Tesler. Tesler passed away earlier this year, and I learned in his obituary how his remarkable innovations helped simplify the everyday lives of millions of people, including mine. Before Tesler, word processing programs had different modes, and the user had to memorize multiple sets of keystroke combinations and how they worked across modes. This complexity always tripped him up, Tesler later recalled, so he set out to create a simpler way to interact with computerized text. It would become his lifelong passion to make computers “user-friendly,” to use the phrase Tesler helped coin. Tesler embodied what developmental psychologists call mastery behaviors—the inclination to seek out challenges, invest effort in learning, persist when difficulty mounts, and rebound from failure.
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